The colours and font settings that the Adaptable Blotter uses are set using a Theme which acts as a 'skin'.
Adaptable Blotter ships with 2 themes - "Light Theme" and "Dark Theme", but works with any Bootstrap compliant theme.
If you don't like either of the pre-installed Themes you can choose to use your own custom theme instead.
Any Bootstrap theme will be suitable.
You specify your themes using config (see Theme Config for more information).